Transmission packet for performing multic-functions over network and communication method and apparatus using the transmission packet

ABSTRACT

A transmission packet usable to perform multiple operations including scanning and is transmitted via a network in order to achieve communications in at least one server shared by at least one client via the network. The transmission packet includes a version field, a packet form display field, an operation form display field, an attribute group field and/or a data group field, and an end field. The packet form display field has packet form display information that represents a form in which the transmission packet is generated. The operation form display field has operation form display information that represents a form of an operation using the transmission packet. The attribute group field and/or a data group field have one of first information associated with attributes of the operation and second information associated with data regarding the operation.

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims the benefit of Korean Patent Application No. 02-31990, filed Jun. 7, 2002 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to the execution of multiple functions, such as scanning, printing, and faxing, and more particularly, to a transmission packet used to perform multiple functions over a network and a communication method and apparatus to perform the multi-functions using the transmission packet.

[0004] 2. Description of the Related Art

[0005] Only one Internet printing protocol (IPP) exists for controlling printers through the Internet. However, while there are no protocols used to control scanners through the Internet, scanned documents are currently transmitted to clients through the Internet. For example, the U.S. Pat. No. 6,256,662 discloses a conventional method of transmitting scanned documents through the Internet. In the disclosed conventional method, documents are scanned using a multi-functional peripheral apparatus, such as a server, over a network according to a client's instruction. The scanned documents are then transmitted to the client over the network. In other words, in order to receive the scanned documents, the client must first open a scanning associated application, and the scanning order from the client must be given.

[0006] As described above, the conventional method cannot perform a scanning without a client's instruction. Also, according to the conventional method, if a client does not open a scanning associated application, the scanned documents are not transferred to the client. Also, in the conventional method, it is impossible to find a server having a scanning function among several servers. Furthermore, the scanning by a server cannot be controlled, the state of the server for scanning cannot be checked, and the server itself cannot be controlled. In addition, in the conventional method, there is a possibility that a client cannot properly receive the scanned documents from a server. Furthermore, a network scanning protocol according to the disclosed conventional method depends on the operating systems of a server and a client, thus increasing the restrictions on the design of a scanning protocol.

[0007] As a result, in the conventional method, clients cannot share a multi-functional peripheral apparatus over a network. Also, the conventional method requires an extra management protocol in order for a server to control clients.

SUMMARY OF THE INVENTION

[0008] To solve the above-described and/or other problems, it is an aspect of the present invention to provide a multi-functional transmission packet for use in performing multiple operations, including a control operation between servers and clients over a network irrespective of the state of the clients.

[0009] It is another aspect of the present invention to provide a communication method for use in performing multiple functions over a network using the transmission packet.

[0010] It is a further aspect of the present invention to provide a communication apparatus for use in performing multiple functions over a network using the transmission packet.

[0011] Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

[0012] To achieve the above and/or other aspects, an aspect of the present invention provides a transmission packet which performs at least K (K≧1) operations including scanning, and is transmitted over a network in order to achieve communications between N (N≧1) servers shared by M (M≧1) clients via the network.

[0013] According to an aspect of the invention, the transmission packet includes a version field, a packet form display field, an operation form display field, an attribute group field and/or a data group field, and an end field, where the version field has version information representing a version number of the transmission packet, the packet form display field has packet form display information that represents a form in which the transmission packet is generated, the operation form display field has operation form display information that represents a form of an operation using the transmission packet among the K operations, the attribute group field and/or a data group field have at least one of first information associated with attributes of the operation and second information associated with data regarding the operation, and the end field has end information representing the end of the packet.

[0014] Another aspect of the present invention provides a communication method of performing an operation between a client and a server using the transmission packet, the communication method including selecting a server having a desired attribute among attributes associated the server and the attributes of the operation to be performed, checking a current status of the discovered server, selecting the server capable of receiving information using the checked status of the discovered server, requiring the selected server to asynchronously notify an event, and performing the operation between the client and the server.

[0015] A further aspect of the present invention provides a communication apparatus which performs an operation between a client and a server using the transmission packet, the communication apparatus including a client which broadcasts a desired attribute among the attributes associated with a server and an operation to be performed in order to require server having the desired attribute to disclose its identity, checks a current status of the disclosed server, selects the disclosed server capable of receiving information using the checked server status, requires the selected server to asynchronously notify an event, and transmits the attributes and data necessary to perform the operation to the server.

[0016] According to an aspect of the present invention, the server responds with information on whether the server has the desired attribute, responds to a request for the current status of the server, responds to a request for asynchronously notifying the event, receives the attributes and data necessary to perform the operation, and performs the operation using the received attributes and data.

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and/or other aspects and advantages of the present invention will become more apparent by describing in detail embodiments thereof with reference to the accompanying drawings in which:

[0018]FIG. 1 is a schematic view of a transmission of a transmission packet according to an embodiment of the present invention;

[0019]FIG. 2 shows the format of a transmission packet according to an embodiment of the present invention;

[0020]FIG. 3 shows an embodiment of the attribute group field of FIG. 2;

[0021]FIG. 4 shows an embodiment of the attribute field of FIG. 3;

[0022]FIG. 5 shows an embodiment of the data group field of FIG. 2;

[0023]FIG. 6 shows an embodiment of the data field of FIG. 5;

[0024]FIG. 7 is a flowchart illustrating a communication method of performing multiple functions using the above-described transmission packet, according to an embodiment of the present invention;

[0025]FIG. 8 is a flowchart illustrating an embodiment of operation 120 of FIG. 7;

[0026]FIG. 9 is a flowchart illustrating an embodiment of operation 128 of FIG. 7;

[0027]FIG. 10 is a flowchart illustrating another embodiment of operation 128 of FIG. 7; and

[0028]FIG. 11 is a flowchart illustrating a communication method of performing multiple functions using the above-described transmission packet, according to a another embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

[0030] A transmission packet which performs multiple functions over a network according to the present invention will now be described with reference to the accompanying drawings. FIG. 1 illustrates a transmission of a transmission packet according to an embodiment of the present invention. The transmission packet is transmitted over a network 14 between first through M-th clients 10, . . . , and 12 and first through N-th servers 16, . . . , and 18. Here, M and N are equal to or greater than 1. The network 14 can be any network including wired and wireless networks.

[0031] Referring to FIG. 1, each of the first through N-th servers 16, 18 performs K (K≧1) operations. According to an aspect of the invention, the operations include at least a scanning operation. The first through N-th servers 16, 18 are shared by the first through M-th clients 10, 12 through a network 14. The operations performed by each of the first through N-th servers 16, and 18 include scanning, faxing, printing, copying, and/or data transmission. However, it is understood that other operations could be included.

[0032] A transmission packet of the present invention transmitted to perform multiple functions between the client 10 or 12 and the server 16 or 18 over the network 14 will now be described with reference to FIG. 2. Referring to FIG. 2, the transmission packet includes a version field 20, a packet form display field 22, an operation form display field 24, an attribute group field 26, a data group field 28, and an end field 30. The version field 20 has version information representing the version number of the packet. If the version field 20 is composed of 2 bytes, the first byte corresponds to the version information representing the major version number, and the second byte corresponds to the version information representing the minor version number. The packet form display field 22 has packet form display information representing the generation form of the transmission packet (i.e., represents for which purpose a packet is generated).

[0033] Here, the generation form of the packet which includes the packet form display information can be at least one among a request purpose, a response purpose, and a trap purpose. As described above, between the client 10 or 12 and the server 16 or 18, a transmission packet can be generated as a request for a predetermined action, or as a response to the requested action. Alternatively, the transmission packet can be generated as a trap for the server 16 or 18 to inform the client 10 or 12 of a certain fact although the client 10 or 12 has not requested any action from the server 16 or 18. The transmission packet can also be generated for at least two composite purposes among the request purpose, the response purpose, and the trap purpose. That is, the trap information can be added to a transmission packet for responding to the client's 10 or 12 request from the server 16 or 18, and the response transmission packet with the trap information can be transmitted from the server 16 or 18 to the client 10 or 12. Accordingly, when the server 16 or 18 makes a request from or responds to the client 10 or 12, the server 16 or 18 can report an error through the trap transmission packet.

[0034] If the packet form display field 22 is composed of one byte, the packet form display information included in the display field 22 can be expressed as in Table 1. TABLE 1 “high” logic level Packet form location at one byte display information 0x01 For request 0x02 For response 0x04 For trap

[0035] Here, “0x” indicates that the values 01, 02, and 04 following “0x” are hexa values.

[0036] The operation form display field 24 of FIG. 2 has operation form display information representing the form of an operation using a packet among the K operations of each server. For example, if the operation form display field 24 is formed of one byte, the operation form display information can be expressed as in Table 2. TABLE 2 “high” logic level Operation form location at one byte display information 0x01 For printing 0x02 For scanning 0x04 For faxing 0x08 For controlling the operation of a set for MFP 0xFF For controlling all operations, such as printing, scanning, and faxing

[0037] The attribute group field 26 has first information associated with the attribute of an operation to be performed in a server. The data group field 28 has second information associated with data for an operation to be performed in a server. According to an aspect of the present invention, the packet of FIG. 2 can have at least one among the attribute group field 26 and the data group field 28. That is, a transmission packet according to the present invention can have either the attribute group field 26 or the data group field 28, or both fields 26, 28.

[0038] Hereinafter, an embodiment of the attribute group field 26 will be described. FIG. 3 shows the format of an attribute group field 26A of FIG. 2. The attribute group field 26A includes an attribute form display field 40 and an attribute field 42. The attribute form display field 40 of FIG. 3 has attribute form display information representing the form of an attribute-related operation. Here, the attribute form display information can be at least one of the control attribute of an operation, the state of the server 16 or 18, and the information attribute of the server 16 or 18.

[0039] The aforementioned first information includes the attribute of an operation and the attribute form display information. For example, if the attribute form display field 40 is composed of one byte and an operation capable of being performed in each server 16 or 18 is printing, scanning, or faxing, a list of attribute form display information can be expressed as in Table 3. TABLE 3 “high” logic level position in one byte Attribute form display information 0x01 and 0x02 Withheld to be used later 0x03 Control attributes of a server 0x04 State attributes of the server 0x05 Information attributes of the server 0x06˜0x0F Withheld for attributes of the other servers 0x11 Attributes of a printing operation 0x12 Printing operation control attributes 0x13 Printing control attributes 0x14 Printing state attributes 0x15 Printing information attributes 0x16˜0x1F Withheld for attributes of the other printing operations 0x20 Withheld for scanning attributes 0x21 Attributes of a scanning operation 0x22 Scanning operation control attributes 0x23 Scanning control attributes 0x24 Scanning state attributes 0x25 Scanning information attributes 0x26˜0x2F Withheld for attributes of the other scanning operations 0x30 Withheld for faxing attributes 0x31 Attributes of a faxing operation 0x32 Faxing operation control attributes 0x33 Faxing control attributes 0x34 Faxing state attributes 0x35 Faxing information attributes 0x36˜0x3F Withheld for attributes of the other faxing operations 0x40˜0xFF Withheld to be used later

[0040] In Table 3, the printing operation attributes, the scanning operation attributes, and the faxing operation attributes are used to set values that are used to perform printing, scanning, and faxing, respectively. The printing operation control attributes, the scanning operation control attributes, and the faxing operation control attributes are used to control operations, such as, to control a printing operation, a scanning operation, and a faxing operation, respectively, or change the priority order of the operations. The server control attributes, the printing control attributes, the scanning control attributes, and the faxing control attributes are used to control the server 16 or 18. The server state attributes, the printing state attributes, the scanning state attributes, and the faxing state attributes are used to ask the state of the server 16 or 18 or the client 10 or 12. The server information attributes, the printing information attributes, the scanning information attributes, and the faxing information attributes are used to ask the information of the server 16 or 18 or the client 10 or 12.

[0041] As can be seen from Table 3, in the present invention, the attribute form display field 40 has at least one field whose use is not determined but is withheld.

[0042] Hereinafter, an embodiment of the attribute field 42 will be described. FIG. 4 shows an attribute field 42A, which is an embodiment of the attribute field 42 of FIG. 3. The attribute field 42A includes an attribute name length field 60, an attribute name field 62, an attribute data form field 64, an attribute data length field 66, and an attribute data field 68. Referring to FIG. 4, the attribute name field 62 represents the name of an attribute, and, for example, can be composed of 1 to 65535 bytes. The attribute name length field 60 represents the length of the attribute name of the attribute name field 62. For example, the attribute name length field 60 can be composed of 2 bytes. The attribute data field 68 has attribute data related to the attribute. For example, the attribute data field 68 can be composed of 1 to 65535 bytes. The attribute data form field 64 has attribute data form information representing the form of the attribute data of the attribute data field 68. If the attribute data form field 64 is composed of one byte, a list of attribute data form information can be expressed as in Table 4. TABLE 4 “high” logic level Attribute position in one byte data form information 0x01 Signed byte 0x02 Unsigned byte 0x03 Signed word 0x04 Unsigned word 0x05 Signed long 0x06 Unsigned long 0x07 Signed float 0x08 Unsigned float 0x09 String having null byte at the end 0x0A Internet Protocol (IP) address form for network IP address 0x0B A series of bytes 0x0C Two byte characters 0x0D A series of unicodes

[0043] Here, the attribute data form information are bytes, words, longs, or floats because an effective message can be obtained by dividing and interpreting the attribute data of the attribute data field 68 in units of one byte, 2 bytes, 4 bytes, or 8 bytes. As can be seen from Table 4, the attribute data form information of the attribute data form field 64 represents whether the attribute data included in the attribute data field 68 has a sign, or represents the effective length of the attribute data for representing an effective message (i.e., one byte, 2 bytes, 4 bytes, or 8 bytes). Here, the attribute data length field 66 has information on the length of the attribute data of the attribute data field 68. For example, the attribute data length field 66 can be composed of 2 bytes.

[0044] Hereinafter, a data group field 28A, which is an embodiment of the data group field 28 of FIG. 2, will be described with reference to FIG. 5. The data group field 28A is composed of a data form display field 80 and a data field 82. The data form display field 80 of FIG. 5 has a data operation form information representing the form of an operation that uses the data included in the data field 82. For example, if the data operation form information is composed of one byte, and printing, scanning, or faxing can be operated in each server 16 or 18, the data operation form information can be expressed as in Table 5. TABLE 5 “high” logic level Data operation position in one byte form information 0x80 The entire operation 0x81˜0x8F Withheld to be used later 0x90 Printing operation 0x91˜0x9F Withheld to be used later 0xA0 Scanning operation 0xA1˜0xAF Withheld to be used later 0xB0 Faxing operation 0xB1˜0xFF Withheld to be used later

[0045] As can be seen from Table 5, in the present invention, the data form display field 80 can have at least one field whose use is not determined but is withheld for later use.

[0046] The data field 82 of FIG. 5 has third information regarding data and the data itself. The third information and the data operation form information correspond to the aforementioned second information.

[0047] Hereinafter, a data field 82A, which is an embodiment of the data field 82 of FIG. 5, will be described with reference to FIG. 6. The data field 82A includes a data external form display field 100, a data order field 102, a data length field 104, and a data sub-field 106. The data sub-field 106 of FIG. 6 has the data itself. The data external form display field 100 has data external form information representing the external form of the data included in the data sub-field 106. If the data external form information is composed of one byte, it can be expressed as in Table 6. TABLE 6 “high” logic level Data external position in one byte form information 0x01 Text form 0x02 Binary form 0x04 Compressed form

[0048] As can be seen Table 6, the data included in the data sub-field 106 can be given in a compressed form, a text form, or a binary form, or in at least two forms among the compressed form, the text form, and the binary form. For example, the data included in the data sub-field 106 can have a compressed binary form or a compressed text form.

[0049] The data order field 102 of FIG. 6, when the data sub-field 106 has segmented data, has order information representing the order of the data before being segmented. For example, the data order field 102 is composed of two bytes. If data is segmented and the segmented data are stored in the data sub-field 106, the order information represents the order of data segment. The data length field 104 has data length information regarding the length of the data included in the data sub-field 106. For example, the data length field 104 can be composed of 4 bytes.

[0050] The data external form information included in the data external form display field 100 of FIG. 6, the data length information included in the data length field 104, and the order information included in the data order field 102 correspond to the third information.

[0051] Referring back to FIG. 2, the end field 30 has end information representing the end of a packet. For example, the end field 30 can be composed of one byte and expressed as 0x00.

[0052] Hereinafter, an embodiment of a communication method for performing multiple functions using the above-described transmission packet, according to the present invention, and a communication apparatus performing the method will be described with reference to the accompanying drawings.

[0053]FIG. 7 is a flowchart illustrating an embodiment of a communication method of performing an operation corresponding to multiple functions using the above-described transmission packet. The method includes discovering a server having a desired attribute (operation 120), asking a server selected from the discovered servers to notify of an asynchronous event (operations 122 through 126)), and performing operations and selectively changing the performed operations (operations 128 and 130). The method of FIG. 7 can be instructions encoded on a computer readable medium or media for use by the clients 10, 12 and/or servers 16, 18.

[0054] In the communication method, the client 10, or 12 discovers among the first through N-th servers 16 and 18, the server 16 or 18 having a desired attribute from attributes regarding the servers 16 and/or 18 and attributes regarding the operation to be performed in the servers 16, 18 (operation 120). Here, the attributes regarding the servers 16, 18 and/or operations indicate at least one among the number of operations performed by the server 16 or 18, the spatial positions of the servers 16 and 18, whether the servers 16 and 18 can support security, whether the servers 16 and 18 are required to be authenticated before being used, whether the servers 16 and 18 perform operations in color, the resolutions of the results of the operations to be performed by the servers 16 and 18, and the size of paper that the servers 16 and 18 can handle. It is understood that other attributes may be included depending on the needs of the clients 10, 12.

[0055]FIG. 8 is a flowchart for illustrating an operation 120A, which is an embodiment of operation 120 of FIG. 7. The operation 120A includes discovering the server 16 or 18 having a desired attribute by broadcasting the desired attribute (operations 150 and 152). A client 10 or 12 broadcasts a desired attribute to the servers 16 and 18 and requires the server 16 or 18 having the desired attribute to disclose its identity (operation 150). After operation 150, the N servers 16, . . . , and 18 inform the client 10 or 12 of information on whether they have the desired attribute. The client 10 or 12 discovers the server 16 or 18 having the desired attribute through the information received from the servers 16 and 18 (operation 152).

[0056] Referring back to FIG. 7, after operation 120, the client 10 or 12 installs a driver if necessary for operation execution using the discovered server 16 or 18, and selectively installs an application for the operation execution (operation 122). For example, for printing and faxing, the client 10 or 12 needs to install the necessary driver. For scanning, the client 10 or 12 does not need to install the driver. Therefore, for all of printing, scanning, and faxing, the client may or may not install the application.

[0057] For example, the client 10 or 12 requests, from the discovered server 16 or 18, the driver and application for the operation execution that need to be installed. Here, the discovered server 16 or 18 provides the client 10 or 12 with the driver and application requested by the client 10 or 12 in the form of a file or a universal resource location (URL). The client 10 or 12 installs the driver and application according to information received from the server 16 or 18.

[0058] After operation 122, the client 10 or 12 checks the current state of the discovered server 16 or 18 (i.e., the server 16 or 18 that disclosed that it has the desired attribute) (operation 124). That is, the client 10 or 12 requests the discovered server 16 or 18 to tell its current state, and the requested server 16 or 18 responds to the client 10 or 12 with the current state of the requested server 16 or 18. At this time, according to an aspect of the present invention, the client 10 or 12 may also check the ability of the server 16 or 18 together with the current state of the server 16 or 18.

[0059] The current state and/or ability of server 16 or 18 to be checked indicates at least one of the unchangeable ability among the abilities of the server 16 or 18, the changeable state of the server 16 or 18 (e.g., running out of paper), whether the operation that the client 10 or 12 previously requested from the server 16 or 18 exists, the progress state of the operation that the client 16 or 18 requires the server 16 or 18 to perform (i.e., whether the operation is in stand-by state, being performed, or completed), whether the server 16 or 18 can perform the operation required by the client 10 or 12, and the priority order in which the operation required by the client 10 or 12 is performed, and the number of times of executions of the operation.

[0060] Also, according to an aspect of the invention, no matter what manner is used for the communications between the client 10 or 12 and the server 16 or 18, the client 10 or 12 can check the current state of the server 16 or 18. For example, regardless of whether the communications between the client 10 or 12 and the server 16 or 18 are performed in a point-to-point manner or a multi-to-multi manner, the client 10 or 12 can check the current state of the server 16 or 18.

[0061] In the present invention, the communication method of FIG. 7 need not include operation 122. That is, if scanning is the operation to be performed among the operations that can be performed between the client 10 or 12 and the server 16 or 18 across the network 14, the client 10 or 12 does not need to install a driver. In this case, if the client 10 or 12 does not need to install an application, the method of FIG. 7 does not include operation 122. If the method of FIG. 7 does not include operation 122, the client checks the current state of the discovered server, after operation 120. While an example is used in which the scanning operation does not require a driver, it is understood that, according to the clients 10, 12 and servers 16, 18 utilized, others of the operations including faxing and printing may also not need to include a driver, and conversely, that the scanning may require a driver.

[0062] After operation 124, the client 10 or 12 selects the server 16 or 18 capable of receiving information, using the checked current state of the server 16 or 18, and requires the selected server 16 or 18 to notify an event in an asynchronous trap manner (operation 126). That is, the client 10 or 12 subscribes to the asynchronous notification in the server 16 or 18.

[0063] The notification manner can differ depending on the type of generated events. For example, the server 16 or 18 may periodically notify a generated event to the client 10 or 12 or notify intermittently whenever the event is generated. The event indicates at least one among the current states of the operation performed by the server 16 or 18, whether the operation performed by the server 16 or 18 is completed, whether the results of the performance of operation exist (i.e., whether a scanned document exists or whether a document received from an external source through a fax machine exists), whether it is necessary for the client 10 or 12 to re-transmit to the server 16 or 18 information necessary to perform the operation due to fatal errors, whether a situation affecting the operation while it is waiting (e.g., “out of paper” or “toner low”) is generated, and whether effective data to be processed is generated. Accordingly, the server 16 or 18 which is requested to asynchronously notify the event notifies the client that the event has occurred. In the present invention, when the server 16 or 18 notifies that the event has occurred, registered information regarding clients 10 and 12 not notified of the event may be erased from the server 16 or 18.

[0064] After operation 126, the client 10 or 12 and the server 16 or 18 perform an operation (operation 128).

[0065] Hereinafter, embodiments of operation 128 of FIG. 7 will be described with reference to the drawings. FIG. 9 is a flowchart for illustrating operation 128A, which is one embodiment of operation 128 of FIG. 7. Operation 128A includes requiring the server 16 or 18 to perform the operation (operation 170) and performing the operation according to whether the required operation can be performed (operations 172, 174, 176). After operation 126, the client 10 or 12 requires the server 16 or 18 to perform the operation that the client 10 or 12 can order the server 16 or 18 to perform. Such operations include, but are not limited to, printing or faxing (operation 170). After operation 170, the server 16 or 18 required to perform the operation responds to the client 10 or 12 whether the server 16 or 18 can process the requested operation (operation 172). For example, the client 10 or 12 inquires of each server 16 or 18 which function the server 16 or 18 has, to what extent the server 16 or 18 can perform its functions, and the like, in operation 170. Each server 16 or 18 responds to the inquiries about the type of functions that the server 16 or 18 has and the degree to which the functions of the server 16 or 18 can be performed (operation 172).

[0066] After operation 172, the client 10 or 12 receives a response as to whether the required operation can be processed from the server 16 or 18, analyzes the received response in order to determine whether the server 16 or 18 can process the required operation, and lets the server 16 or 18 perform the required operation if it is determined that the operation can be processed (operations 174 and 176). To be more specific, if it is determined that the server 16 or 18 can process the required operation, the client 10 or 12 provides the server 16 or 18 with the attributes of the required operation and the operation data necessary to perform the required operation (operation 174). Here, the operation data can be transmitted from the client 10 or 12 to the server 16 or 18 in the form of a file, a raw data, or an address having a file. After operation 174, the server 16 or 18 performs the required operation using the received attributes and operation data (operation 176).

[0067]FIG. 10 is a flowchart illustrating operation 128B, which is another embodiment of operation 128 of FIG. 7. Step 128B includes operations 190 through 198 of performing an operation when the identifier and password of the client provided by an external source are effective. After operation 126, the client 10 or 12 designates the desired server 16 or 18 to perform scanning among the servers 16 and 18 (operations 190, 192, 194). To be more specific, a user who tries to scan a document using an arbitrary server 16 or 18 and to transmit the scanned document to his or her client 10 or 12 provides the identifier and password of the client 10 or 12 to the arbitrary server 16 or 18 (operation 190). In this case, the client 10 or 12 provides the identifier, password, and spatial position of the client 10 or 12 to the server 16 or 18 including the arbitrary server 16 or 18 (operation 190). After operation 190, the server 16 or 18 provided by the user with the identifier and the password determines whether they are effective (operation 192). If it is determined that the identifier and password provided by the user are not effective, the operation is not performed. However, it is determined that the provided identifier and password are effective, the server 16 or 18 provided with the identifier and password is determined as the designated server 16 or 18 (operation 194).

[0068] After operation 194, the designated server 16 or 18 receives the attributes and data necessary to perform the operation from the client 10 or 12 located on the space corresponding to the identifier (operation 196). That is, the client 10 or 12 required by the designated server 16 or 18 to transmit the attributes and data can recognize that the server 16 or 18 is supposed to scan a document. In addition, as described above, the server 16 or 18 brings necessary attributes and data from the client 10 or 12 as needed, and does not need to store in the server the attributes and data. Accordingly, the server 16 or 18 does not need to store the attributes or data of the client 10 or 12.

[0069] After operation 196, the server 16 or 18 performs an operation using the attributes and data and transmits the operation result to the client 10 or 12 every time the operation is performed (operation 198).

[0070] Referring back to FIG. 7, after operation 128, the client 10 or 12 can correct the progress of the operation to be performed by the server 16 or 18 (operation 130). For example, the client 10 or 12 can require the server 16 or 18 to cancel or modify the performance of the previously required operation, or to pause performing the previously required operation and resume the operation. Here, a plurality of operations previously required by the client 10 or 12 can be cancelled at the same time.

[0071] According to the present invention, the communication method of FIG. 7 may not include operation 130. In this case, after operation 176 of FIG. 9, or after operation 198 of FIG. 10, the communication method of FIG. 7 is concluded.

[0072]FIG. 11 is a flowchart illustrating another embodiment of the communication method of FIG. 7. The embodiment in FIG. 11 further includes informing the client 10 or 12 that the operation is completely performed (operations 210 and 212). Specifically, the server 16 or 18 determines whether the operation is completely performed (operation 210). If the communication method of FIG. 7 does not include operation 130, after operation 128, the server 16 or 18 determines whether the operation has been completely performed (operation 210). However, if the communication method of FIG. 7 includes operation 130, the operation 210 is performed after operation 130.

[0073] If it is determined that the operation has not been completed, the method proceeds to operation 128 in order to continue the remaining operation. However, if it is determined that the operation has been completed, the server 16 or 18 informs the client 10 or 12 that the operation has been completed (operation 212). Accordingly, the client 10 or 12 which is to be provided with the scanned document can recognize that the server 16 or 18 has completed scanning, recognize the beginning and end of the scanned document, and concludes the state of the client 10 or 12 itself connected to the server 16 or 18.

[0074] A communication method according to the present invention, in which a server and a client perform multiple functions by mutually transceiving the above-described transmission packet of the present invention via a network (i.e., a network multi-function peripheral protocol (NMFPP)), can be designed independently from the operating systems (OS) of the server and the client and can be located higher than or on a level equal to an application protocol in a protocol hierarchy. Here, in the protocol hierarchy, a protocol is written in more language as it approaches from a lower layer to an upper layer, and is written in more codes as it approaches from an upper layer to a lower layer.

[0075] The NMFPP can also be operated in a security environment. To do this, a security protocol would be used. However, the shown NMFPP does not include extra information for security.

[0076] The servers 16 or 18 of FIG. 1 can have an attribute group and a data group that differ according to the manufacturer of the server 16 or 18. Hence, if the client 10 or 12 is provided with a proposal of the attribute group and the data group that differ according to the manufacturer of the server 16 or 18, implementation of the same communication apparatuses can be prevented, and the inter-operability of information processing can be easily obtained. However, even though the client 10 or 12 is not provided with such a proposal, the client 10 or 12 can transceive the attribute group and data group with the server 16 or 18 through requests and responses.

[0077] Hereinafter, in order to facilitate the understanding of the communication method of performing multiple functions using the above-described transmission packet of the present invention, the format of an example packet transmitted between the client 10 or 12 and the server 16 or 18 will be described with reference to the following tables. For the example, the server 16 or 18 has a 300 dpi (dot per inch) printer, a 600 dpi scanner having an automatic document feeder (ADF), and a dual line facsimile. In this case, when operation 120 of FIG. 7 is performed, the client 10 or 12 can broadcast, for example, a packet as shown in Table 7 to the server. TABLE 7 Reference number Hexa value Symbol value denoting field 0x0100 1.0 (where 1 denotes a major 20 version number and 0 denotes a minor version number) 0x01 For request 22 0xFF For all operations 24 0x05 Information attributes of server 40 0x001D 29 bytes 60 std-device- To obtain resolution 62 printer-resolution 0x04 Unsigned word 64 0x0002 2 bytes 66 0x012C 300 dpi (client requires a printer 68 with a 300 dpi resolution) 0x05 Information attributes of server 40 0x0016 22 bytes 60 std-device- Color printer 62 print-color 0x02 Unsigned byte 64 0x0001 1 byte 66 0x01 True (here, true denotes that a 68 client requires a color printer) 0x05 Information attributes of server 40 0x001D 29 bytes 60 std-device- Resolution of scanner 62 scanner-resolution 0x02 Unsigned word 64 0x0002 2 bytes 66 0x0258 600 dpi (client requires a scanner 68 with a 600 dpi resolution) 0x05 Information attributes of server 40 0x0016 22 bytes 60 std-device- Scanner having ADF 62 scanner-adf 0x02 Unsigned byte 64 0x0001 1 byte 66 0x01 True (here, true denotes that a 68 client requires a scanner having ADF) 0x05 Information attributes of server 40 0x13 19 bytes 60 std-device- Server having a dual fax ability 62 fax-dual 0x02 Unsigned byte 64 0x0001 1 byte 66 0x01 True (here, true denotes that a 68 client requires a server having a dual fax ability) 0x00 End of packet 30

[0078] When a transmission packet carrying such requests as mentioned in Table 7 is broadcasted from the client 10 or 12 to the server 16 or 18, the server 16 or 18 can send a response as shown in Table 8 to the client 10 or 12. TABLE 8 Reference number Hexa value Symbol value denoting field 0x0100 1.0 20 0x02 For request 22 0xFF For all operations 24 0x05 information attributes 40 of server 0x001A 26 bytes std-device-MFP-name Name of server 62 0x09 String 64 0x0006 6 bytes 66 tiger The name of printer 68 is tiger 0x05 information attributes 40 of server 0x0017 23 bytes 60 std-device-IP-address IP address of server 62 0x0A IP address form 64 0x0004 4 bytes 66 A8DB0249 168.219.2.72 68 0x00 End of packet 30

[0079] In this case, when operation 122 is performed, the client 10 or 12 can transmit a packet as shown in Table 9 to the discovered server 16 or 18. TABLE 9 Reference number Hexa value Symbol value denoting field 0x0100 1.0 20 0x01 For request 22 0x03 For printing and scanning 24 0x15 Printing information 40 attributes 0x0017 23 bytes 60 std-device-driver-URL Printer driver URL 62 information 0x09 String 64 0x0002 2 bytes 66 “?” Where is URL? 68 0x25 Scanning information 40 attributes 0x001E 30 bytes 60 std-scanner-driver-URL Scanner driver URL 62 0x09 String 64 0x001A 2 bytes 66 “?” Where is URL? 68 0x00 End of packet 30

[0080] When a transmission packet carrying such requests as mentioned in Table 9 is broadcasted from the client 10 or 12 to the server 16 or 18, the server 16 or 18 can send a response such as shown in Table 10 to the client 10 or 12. TABLE 10 Reference number Hexa value Symbol value denoting field 0x0100 1.0 20 0x02 For request 22 0x03 For printing and 24 scanning 0x15 Printing information 40 attributes 0x0016 22 bytes 60 std-device-driver-URL Printer driver URL 62 information 0x09 String 64 0x001E 30 bytes 66 Mnfp://www.sec.co.kr/printer/ A place that obtains a 68 printer driver is the web site of Mnfp://www.sec.co.kr/printer/ printer driver is the web site of SAMSUNG printer driver 0x25 Scanning information 40 attributes 0x0016 22 bytes 60 std-scanner-driver-URL Scanner driver URL 62 0x09 String 64 0x001A 26 bytes 66 mnfp://www.sec.co.kr/mfp/ A place that obtains a 68 scanner driver is the web site of SAMSUNG scanner driver 0x00 End of packet 30

[0081] In this case, when operation 126 is performed, the client 10 or 12 can transmit, for example, a packet as shown in Table 11 to the selected server 16 or 18. TABLE 11 Reference number Hexa value Symbol value denoting field 0x0100 1.0 20 0x01 For request 22 0x87 For printing, scanning, and 24 faxing 0x13 Printing control attributes 40 0x0024 36 bytes 60 std-printer-control- Service of notifying the state of 62 subscribe-status subscribed printer 0x0A IP address 64 0x0004 4 bytes 66 A8DB0249 168.219.2.72 (client having such 68 an IP address requires server status to be asynchronously notified) 0x23 Scanning control attributes 40 0x0022 34 bytes 60 std-scanner-control- Subscribing of scanning 62 subscribe-scan operation (event is scanned when user depresses the scan button) 0x0A IP address 64 0x0004 4 bytes 66 A8DB0249 168.219.2.72 (client having 68 such an IP address requires scanned document to be asynchronously notified) 0x33 Faxing control attributes 40 0x001A 26 bytes 60 std-fax-control- Notification and subscribing of 62 subscribe-injob incoming faxing operation 0x0A IP address 64 0x0004 4 bytes 66 A8DB0249 168.219.2.72 (client having such 68 an IP address requires incoming faxing operation to be asynchronously notified) 0x03 Server control attributes 40 0x0023 35 bytes 60 std-device-control- Subscribing of server status 62 subscribe-status 0x0A IP address 64 0x0004 4 bytes 66 A8DB0249 168.219.2.72 (client having such 68 an IP address requires server status to be asynchronously notified) 0x00 End of packet 30

[0082] In operation 128, the client 10 or 12 may transmit such a packet as shown in Table 12 to the server 16 or 18 in order to require the server 16 or 18 to perform printing. TABLE 12 Reference number Hexa value Symbol value denoting field 0x0100 1.0 20 0x01 For request 22 0x01 For printing 24 0x11 Printing operation 40 attributes 0x15 21 bytes 60 std-printjob-charset Attributes of character 62 sets for printing 0x09 String 64 0x08 8 bytes 66 US-ASCII US-ASCII (character 68 sets used for printing are US-ASCII characters) 0x11 Printing operation 40 attributes 0x1E 30 bytes 60 std-printjob-natural-language Natural language 62 attributes 0x09 String 64 0x06 6 bytes 66 en-US en-US (natural 68 language used for printing is US language) 0x11 Printing operation 40 attributes 0x10 16 bytes 60 std-printer-URL Printer-URL 62 0x09 String 64 0x1C 28 bytes 66 nmfpp://workgroup/mfp/tiger Multi-function 68 peripheral, called tiger, in work group on network using packet according to the present invention 0x11 Printing operation 40 attributes 0x12 18 bytes 60 std-printjob-name Printing operation 62 name 0x09 String 64 0x0E 14 bytes 66 myprintjob.ps myprintjob.ps 68 Postscript file 0x11 Printing operation 40 attributes 0x14 20 bytes 60 std-printjob-copies The number of copies 62 0x02 Unsigned byte 64 0x01 1 byte 66 0x02 two copies 68 0x11 Printing operation 40 attributes 0x17 23 bytes 60 std-printjob-papersize Paper size attributes 62 0x09 String 64 0x07 7 bytes 66 Letter Letter paper size 68

[0083] When a transmission packet carrying such requests as mentioned in Table 12 is transmitted from the client 10 or 12 to the server 16 or 18, the server 16 or 18 can send a response such as shown in Table 13 to the client 10 or 12. TABLE 13 Reference number Hexa value Symbol value denoting field 0x11 Printing operation  40 attributes 0x14 20 bytes  60 std-printjob- Duplex selection  62 duplex 0x02 Unsigned byte  64 0x01 1 byte  66 0x01 Short edge  68 0x90 Printing  80 0x01 Text form 100 0x00000FDD 4061 bytes (data length) 104 %!PS-Adobe Printing operation using 106 postscript language 0x00 End of packet  30

[0084] In operation 128, the client 10 or 12 may transmit a packet such as shown in Table 14 in order to require the server 16 or 18 to perform scanning. TABLE 14 Reference number Hexa value Symbol value denoting field 0x0100 1.0 20 0x01 For request 22 0x02 For scanning 24 0x22 Scanning operation control 40 attributes 0x17 23 bytes 60 std-scanjobcontrol- Scanning resolution 62 resolution 0x04 Unsigned word 64 0x04 4 bytes 66 0x012C 300 dpi (which means that 68 document is required to be scanned at 300 dpi) 0x0021 Scanning operation attributes 40 0x14 20 bytes 60 std-scanjob-user-ID User ID attributes 62 0x09 String 64 0x06 6 bytes 66 Klee4 User ID is klee4 68 0x22 Scanning operation control 40 attributes 0x18 24 bytes 60 std-scanjobcontrol- Scanning brightness 62 brightness 0x02 Unsigned byte 64 0x01 1 byte 66 0x80 128 (here, 128 denotes the 68 briqhtness of scanning) brightness of scanning) 0x22 Scanning operation control 40 attributes 0x1C 28 bytes 60 std-scanjobcontrol- Contrast of scanning 62 contrast 0x02 Unsigned byte 64 0x01 1 byte 66 0x80 128 (here, 128 denotes the 68 contrast between maximum value and minimum value) 0x21 Scanning operation attributes 40 0x13 19 bytes 60 std-scanjob- The number of copies of 62 copies scanning 0x02 Unsigned byte 64 0x01 1 byte 66 0x02 Copying of 2 copies (which 68 denotes 2 copies per scanned page) 0x00 End of packet 30

[0085] In operation 128, the client 10 or 12 may transmit a packet such as shown in Table 15 in order to require the server 16 or 18 to perform a faxing operation. TABLE 15 Reference number Hexa value Symbol value denoting field 0x0100 1.0 20 0x01 For request 22 0x03 For faxing 24 0x31 Faxing operation attributes 40 0x13 19 bytes 60 std-faxjob-user-ID User ID attributes 62 0x09 String 64 0x06 6 bytes 66 Klee4 User ID (which denotes the 68 user ID used upon faxing operation) 0x31 Faxing operation attributes 40 0x12 18 bytes 60 std-faxjob-number Fax number 62 0x02 Unsigned byte 64 0x0C 13 bytes 66 9.032004664 9 pause 0312004664 (the 68 dial number of destination) 0x31 Faxing operation attributes 40 0x19 25 bytes 60 std-faxjob-receiver-name Name of fax receiver for 68 logging 0x09 String 64 0x09 9 bytes 66 anonymous (Name of fax receiver) 68 0xB0 Faxing operation 80 0x000000FAA 4010 bytes 104  bitmap data Bitmap data 80 0x00 End of packet 30

[0086] As described above, in a transmission packet according to the present invention which is used to perform multiple functions via a network, and a communication method and apparatus using the transmission packet, regardless of a situation of a client (i.e., even when the client does not open an application for scanning or does not instruct scanning), multiple operations including scanning can be performed between a client and a server. For example, a document scanned by the server according to a user's instruction (i.e., the result of an operation process), can be precisely transmitted to the client without errors. Accordingly, a multi-functional server, such as a multi-functional peripheral, can be shared by multiple clients through a network and can be easily accessed by the clients via the network like an analog copying machine is easily accessed. Also, the clients can control the server without the help of a separate management protocol.

[0087] Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in this embodiment without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents. 

What is claimed is:
 1. A transmission packet which performs at least K (K≧1) operations including scanning, and is transmitted over a network in order to achieve communications between N (N≧1) servers shared by M (M≧1) clients via the network, the transmission packet comprising: a version field having version information representing a version number of the transmission packet; a packet form display field having packet form display information that represents a form in which the transmission packet is generated; an operation form display field having operation form display information that represents a form of an operation using the transmission packet among the K operations; an attribute group field and/or a data group field having at least one of first information associated with an attribute of the operation and second information associated with data regarding the operation; and an end field having end information representing an end of the transmission packet.
 2. The transmission packet of claim 1, wherein the generation form of the transmission packet represented in the packet form display information is at least one of a request, a response, and a trap.
 3. The transmission packet of claim 1, wherein: the attribute group field comprises: an attribute field having the attribute of the operation; and an attribute form display field having attribute form display information that represents a form of the operation associated with the attribute, and the attribute and the attribute form display information correspond to the first information.
 4. The transmission packet of claim 3, wherein the attribute form display information represents at least one among a control attribute of the operation, a status of the server, and an information attribute of the server.
 5. The transmission packet of claim 3, wherein the attribute field comprises: an attribute name field having a name of the attribute; an attribute name length field representing a length of the name of the attribute; an attribute data field having attribute data associated with the attribute; an attribute data form field having attribute data form information that represents a form of the attribute data; and an attribute data length field having information regarding a length of the attribute data.
 6. The transmission packet of claim 5, wherein the attribute data form information represents whether the attribute data is signed or unsigned.
 7. The transmission packet of claim 5, wherein the attribute data form information represents an effective length of the attribute data, the effective length representing an effective message.
 8. The transmission packet of claim 1, wherein: the data group field comprises: a data field having the data of the operation and third information regarding the data; and a data form display field having data operation form information that represents a form of the operation in which the data of the operation are used, and the third information and the data operation form information correspond to the second information.
 9. The transmission packet of claim 8, wherein: the data field comprises: a data sub-field having the data of the operation; a data external form display field having data external form information that represents an external form of the data; a data length field having data length information regarding a length of the data; and a data order field having order information that represents an order of segmented data if the data sub-field has the segmented data, and the data external form information, the data length information, and the order information correspond to the third information.
 10. The transmission packet of claim 9, wherein the external form is at least one of a compressed form, a text form, and a binary form.
 11. The transmission packet of claim 3, wherein the attribute form display field or the data form display field comprises at least one field whose use is not determined but is withheld.
 12. A communication method of performing multiple functions using a transmission packet, in which an operation is performed between the client and the server using the transmission packet of claim 1, the method comprising: discovering the server having a desired attribute among the attributes of the server and the attributes associated with the operation; checking a current status of the discovered server; selecting the server capable of receiving information using the checked status of the discovered server, and requiring the selected server to asynchronously notify an event; and performing the operation.
 13. The communication method of claim 12, further comprising: selectively installing a driver and an application used to perform the operation using the discovered server and then proceeding to checking the current status of the discovered server.
 14. The communication method of claim 13, wherein the selectively installing comprises: requiring the necessary driver and the application to be installed after discovering the server; and providing and installing the required driver and the application.
 15. The communication method of claim 12, after performing the operation, further comprising canceling an execution of the operation.
 16. The communication method of claim 12, after performing the operation, further comprising changing an execution of the operation.
 17. The communication method of claim 12, after performing the operation, further comprising pausing the operation and resuming the operation.
 18. The communication method of claim 12, wherein the discovering the server comprises: broadcasting the desired attribute in order to require the server having the desired attribute to disclose the server's identity; and discovering the server having the desired attribute through responses received from multiple servers including the discovered server.
 19. The communication method of claim 12, wherein the attributes associated with the server and the operation are at least one of a number of operations performed by the server, a spatial location of the server, whether the server can support security, whether the server is needed to be authenticated before being used, whether the server performs the operation in color, a resolution of the result of the operation performed by the server, and a size of paper which the server can handle.
 20. The communication method of claim 12, wherein in the checking the current status, an ability of the server as well as a current status of the discovered server are checked.
 21. The communication method of claim 20, wherein the checked current status of the server and the ability of the server are at least one of an unchangeable ability of the server, a changeable status of the server, whether the operation previously required the server to perform exists, a state of execution of the operation, whether the required operation is capable of being performed, and a priority order of execution.
 22. The communication method of claim 12, wherein the manner in which the server notifies the event varies according to the type of the event.
 23. The communication method of claim 12, wherein the event is at least one of the current status of the server, whether the operation is completely performed by the server, whether the result of the operation exists, whether information necessary to perform the operation needs to be re-transmitted, whether a situation affecting the standing-by operation occurs, and whether effective data to be processed is generated.
 24. The communication method of claim 23, wherein registered information regarding the client not notified of the event is erased.
 25. The communication method of claim 12, wherein the performing the operation comprises: requiring the operation to be performed, after the selecting the server; responding with information on whether the required operation can be performed; and performing the operation depending on the information on whether the operation can be performed.
 26. The communication method of claim 25, wherein the performing the operation depending on whether the operation can be performed comprises: providing the attribute and the data which are necessary to perform the operation; and performing the operation using the provided attribute and data.
 27. The communication method of claim 12, wherein the performing the operation comprises: designating a desired server to perform an operation, after selecting the server; bringing to the server the attribute and the data necessary to perform the operation; and performing the operation using the brought attribute and data and transmitting the result of the operation every time the operation is to be performed.
 28. The communication method of claim 27, wherein the designating the desired server comprises: providing an identifier and a password of the client; determining whether the provided identifier and password are effective; and determining the server provided with the identifier and password to be the designated server, in response to determining that the provided identifier and password are effective, and proceeding to the bringing the attribute and the data necessary from the client to perform the operation, wherein the identifier, the password, and a spatial location of the client are previously provided to the server in the selecting the server.
 29. The communication method of claim 25, wherein the performing the operation comprises: determining whether the operation has been completed, and proceeding to performing the operation depending on the information in response to determining that the operation has not yet been completed, and notifying that the operation has been completed, in response to determining that the operation has been completed.
 30. The communication method of claim 12, wherein a form of data transmitted between the server and the client is one of a file, raw data, and a designated address.
 31. A communication apparatus used to perform multiple functions using a transmission packet, in which an operation is performed using the transmission packet of claim 1, the communication apparatus comprising: a client which broadcasts a desired attribute among attributes associated with a server and the operation in order to require the server having the desired attribute to disclose its identity, generates a request to check a current status of the disclosed server, selects the server capable of receiving information using the checked server status, generates a request to require the selected server to asynchronously notify an event, and transmits the attributes and data necessary to perform the operation to the server; and the server which responds with whether the server has the desired attribute, responds to the request for the current status of the server, responds to the request for asynchronously notifying of the event, receives the transmitted attributes and data necessary to perform the operation, and performs the operation using the received attributes and data.
 32. The communication apparatus of claim 31, wherein: if the client requires a driver to perform the operation and a necessary application from the disclosed server, the client installs the driver and the necessary application received from the server, and the disclosed server provides the driver and necessary application required by the client to the client.
 33. The communication apparatus of claim 31, wherein the client requires the server to cancel or change an execution of a previously required operation.
 34. The communication apparatus of claim 31, wherein the client requires the server to pause performing a previously required operation and to resume the operation.
 35. The communication apparatus of claim 31, wherein the client checks an ability of the server together with the current status of the server.
 36. The communication apparatus of claim 31, wherein the client requires the server to perform the operation and provides the attributes and data necessary to perform the operation to the server, and the server responds with information on whether the server can perform the required operation and performs the operation using the received attributes and data.
 37. The communication apparatus of claim 31, wherein a user desiring to perform an operation designates the server as a desired server to perform the operation, and the server brings the attributes and data necessary to perform the operation from the corresponding client, performs the operation using the brought attributes and data, and transmits the result of the operation to the client every time the operation is performed.
 38. The communication apparatus of claim 37, wherein the user provides an identifier of the client and a password of the client to the server, the server checks whether the identifier and password provided by the user are effective and is determined as the designated server in response to the check result, and the client previously provides the identifier, the password, and a spatial location of the client to the server.
 39. The communication apparatus of claim 36, wherein the server checks whether the operation is completely performed, and notifies the client that the operation has been completed in response to the checked result.
 40. A transmission packet for use between clients and a server having multiple capabilities, the packet comprising: a display field having information that indicates an operation to be performed by the server and which is selectable from among multiple operations using the transmission packet; and a group field including an attribute group and/or a data group having at least one of first information associated with an attribute of the selected operation and second information associated with data regarding the selected operation.
 41. The transmission packet of claim 40, further comprising a form field having information that represents a purpose of the transmission packet.
 42. The transmission packet of claim 41, wherein the form field indicates the purpose as one of a request, a response, and a trap.
 43. The transmission packet of claim 41, wherein the transmission packet indicates the purpose as being two of a request, a response, and a trap.
 44. The transmission packet of claim 40, wherein the group field comprises the attribute group and the first information indicates data related to configuring the client to install a program file not active in the client and which is related to performing the selected operation.
 45. The transmission packet of claim 40, wherein the group field comprises the attribute group and the first information indicates data related to one of paper size, color, resolution, and location of one of the client and server.
 46. The transmission packet of claim 45, wherein the operation is selectable between a facsimile operation, a printing operation, and a scanning operation.
 47. The transmission packet of claim 40, wherein the operation is selectable between a scanning operation and another non-scanning operation.
 48. A computer readable medium encoded with instructions for implementing a method of performing multiple functions to performed by a computer using a transmission packet format of claim 40, in which an operation is selected from multiple operations and performed between the client and the server using the transmission packet format, the method comprising: generating a first transmission packet having the transmission packet format to discover the server having a desired attribute associated with the selected operation; using a second transmission packet having the transmission packet format to select the discovered server; and using a third transmission packet having the transmission packet format to require the selected server to perform the operation.
 49. The computer readable medium of claim 48, wherein the operation is selectable using the transmission packet format between a facsimile operation, a printing operation, and a scanning operation.
 50. The computer readable medium of claim 48, the method further comprising selectively installing a program according to a requirement in one of the first, second, and third transmission packets, the program being received at the client and related to the operation to be performed by the server.
 51. The computer readable medium of claim 48, the method further comprising, as the server is performing the operation, using a fourth transmission packet having the transmission packet format to cancel an execution of the operation by the server.
 52. The computer readable medium of claim 48, the method further comprising, as the server is performing the operation, using a fourth transmission packet having the transmission packet format to change an execution of the operation by the server.
 53. The computer readable medium of claim 48, the method further comprising, as the server is performing the operation, using a fourth transmission packet having the transmission packet format to pause an execution of the operation by the server.
 54. The computer readable medium of claim 48, wherein the generating the first transmission packet comprises broadcasting the desired attribute in order to require the server having the desired attribute to disclose the server's identity; and discovering the server having the desired attribute through responses received from multiple servers including the discovered server.
 55. The computer readable medium of claim 48, wherein the group field includes attributes associated with the server and the operation and are at least one of a number of operations performed by the server, a spatial location of the server, whether the server can support security, whether the server is needed to be authenticated before being used, whether the server performs the operation in color, a resolution of the result of the operation performed by the server, and a size of paper which the server can handle.
 56. A client apparatus which communicates with a server using transmission packets to select and perform one of multiple operations, each transmission packet having a packet format of the transmission packet of claim 40, the client apparatus to broadcast using one transmission packet a desired attribute among attributes associated with the selected one operation in order to require the server having the desired attribute to disclose its identity, to use another transmission packet to select the server capable of receiving information using the disclosed server, and to use an additional transmission packet to transmit the attributes and/or data necessary to perform the selected one operation using the selected server.
 57. A server apparatus which receives requests from a client using transmission packets so as to select an operation from one of multiple operations, each transmission packet having a packet format of the transmission packet of claim 40, the server apparatus to use one transmission packet to respond to a received request from the client in which a desired attribute is included using another transmission packet and to identify the server apparatus when the server apparatus has the desired attribute, to use a further transmission packet to receive the attributes and/or data necessary to perform the selected operation required by the client, and to perform the operation using the received attributes and/or data. 